Hello,
OnTap 9.5P14
BTW, web client host web access https://filer_ip/sysmgr , OnCommand Ssystem Manager login display and it should not network cannot reach Filer.
I have enable Filer packet trace e0M (cluster management IP IN e0M), when try add Filer cluster_management_IP with HTTPS in SnapCenter Plug-in and display "handshake_failure", use wireshark review Filer packet trace, it did not display any port access 80 or 443 information.
Best regards,
Chung